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Synonyms for Jejune (same or very similar meaning)

WordNet sense 1 (lacking in nutritive value):
insubstantial

WordNet sense 2 (detrimental to physical or moral well-being):
unwholesome

WordNet sense 3 (displaying or suggesting a lack of maturity):
adolescent, juvenile, puerile

WordNet sense 4 (characteristic of a lack of maturity):
immature

WordNet sense 5 (lacking interest or significance):
insipid


From the ODE community, based on WordNetadd/edit